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Pension and Other Postretirement Healthcare Benefits - Schedule of Changes in Fair value of Level 3 plan assets (Detail) (U.S. Level 3 Assets [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Beginning Balance	$ 22
Transfers to Level 2	(22)
Ending Balance
International Comingled Funds US Equity [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Beginning Balance	22
Transfers to Level 2	(22)
Ending Balance

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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